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Trans-Neptunian object

2004 FW164

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(2004 FW164)

Where is it now

Distance from Sun
34.518 AU
True anomaly
43.43°
Distance from Earth
35.295 AU
As of
16 October 2026

Two-body Kepler propagation — accurate to ~0.1% for major planets over decades, less so for highly-perturbed bodies. Use JPL Horizons for high precision.

Sun Earth — 0.997 AU from the Sun Earth 2004 FW164 — 34.518 AU from the Sun 2004 FW164
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2004 FW164 is 35.295 AU from Earth today (4.9 light-hours).

In the sky

Right ascension
16h 01m 43s
Declination
-14° 16′ 54″
Constellation
Libra
Distance from Earth
35.3 AU
Elongation from the Sun
37.65° — near the Sun — look low at dusk or dawn

Visible from both hemispheres.

From your location

See how high it is right now, whether it is up after civil twilight, and when it rises and sets where you are.

How do I find my coordinates?

Google Maps on a computer

  1. Right-click the spot where you'll be observing.
  2. The first line of the menu is the coordinates, e.g. 51.50722, -0.12758 — click it and they're copied.
  3. Paste them above.

Google Maps on a phone

  1. Press and hold the spot to drop a pin.
  2. The coordinates appear in the search bar (or on the pin's card) — tap to copy, then paste above.

A full Google Maps link works too, but the short maps.app.goo.gl share links don't carry coordinates — copy the numbers instead. We round to about a kilometre; that's all the sky calculation needs.

Know your what3words address? Paste it, e.g. ///filled.count.soap. This is optional — the three words are sent to what3words to convert them, and we don't store the address or the result.

Your location stays in your browser and is sent only for this calculation. Using a what3words address is optional; if you do, the three words go to what3words to be converted and we don't record them. Set a location first, then you can save an email alert for this object. See our privacy policy.

Two-body approximation, good to about a degree for the planets — enough to find the constellation and know whether it is up.

Orbital elements

Semi-major axis
39.392 AU
Eccentricity
0.1561
Inclination
9.13°
Orbital period
247.2 years
Perihelion
33.242 AU
Aphelion
45.543 AU
Longitude of ascending node
197.99°
Argument of periapsis
1.2°
Epoch · J2000
2461200.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 12,547.2 LD
32.2406 AU
Tisserand (Jupiter)
5.499

Orbit quality

Orbit reasonably well determined (uncertainty code 4).

Observations used
46
Data arc
17.3 years
First observed
20 March 2004
Last observed
9 July 2021
Residual RMS
0.18 ″
Solution · Otto Matic
17 September 2025

Visual & observation

Absolute magnitude (H)
7.91

Discovery & classification

TNO

Sources